American bystander rule: there is no legal duty to rescue or call for help to aid someone who's in danger even if helping poses no risk whatsoever to the potential rescuer.
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The answer depends on the context. There are rules for sequences, rules for regression, rules for scientific laws to name a few examples.
Aristotle came up with the rule by few, rule by one, and the rule by many.
No rule
What is the divisblity rule by 8
Kadema's Rule